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but, after his death, the empire fragmented and subsequent rulers and various localities introduced their own variants. Some of Charlemagne's units, such as the king's foot remained virtually unchanged for about a thousand years, while others important to commercesuch as the French ell aune used for cloth and the French pound livre used for amountsvaried dramatically from locality to locality. By the 18th century, the number of units of measure had grown to the extent that it was almost impossible to keep track of them and one

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